How long did the Longjiang County fire last?

GWIS (Copernicus) dates it between 25 October 2025 and 30 October 2025: 6 days between the first and last heat detection of the perimeter.

How much area did it burn?

The perimeter GWIS (Copernicus) rebuilt from heat detections is 1,130 hectares (11.3 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire only entered Longjiang County (1,126 ha, 0.2 %).

What was the weather like?

During the fire the temperature reached 8.4 °C, humidity dropped to 28 % and gusts hit 46 km/h. The fire danger index (FWI) reached 13, class Moderate.

Where does this data come from?

From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of China (geoBoundaries). It is not an official report.

CN · China · 2025-10-25 → 2025-10-30

Longjiang County fire, 25 October 2025 Longjiang County

Out · last detection 30 Oct 2025, 05:06 UTC

The fire started on 25 October 2025 in Longjiang County, China, and satellites saw it burning for 6 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 1,130 hectares from heat detections, spread across a single municipality.

It is the 1425th largest in Heilongjiang Province since 2016 (of 1751 with a page). Number 624 in China in 2025, of 736.

The power measured by the satellite is low (11.3 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.

Burnt area: 1,130ha; GWIS perimeter (Copernicus)
Duration: 6days; 25 Oct 2025 – 30 Oct 2025
Municipalities hit: 1; counties
Started on: 25 Oct; 2025
Heat detections: 23; in a single hotspot: 11 MW
Danger at start: 12; Moderate · FWI index
Energy released: 99MW; sum of detected power

Play back 30 Oct 2025

HOTSPOTS BY DAY 25 Oct30 Oct

How it evolved, day by day

262730

Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.

The weather it burned in

8°high

46km/h · peak gust

28%lowest humidity

It had gone 7 days without rain (1 mm or more) when it started. Rain came after the fire: 1.2 mm on 8 Nov.

This area had burned before

35% of the perimeter overlaps earlier fires recorded since 2016: 272 ha in 2017, 197 ha in 2019, 29 ha in 2020. Part of it burned more than once, so the yearly figures add up to more than the 396 ha that had burned before.

29 ha Longjiang County fire, April 2020 19,521 ha in total; the hectares shown are those it shares with this fire

What happened to each town

Longjiang County where it started

1,126 ha

0.2 %

Burnt area inside each municipality, from crossing the GWIS perimeter with administrative boundaries. The distance is from the town centre to the nearest fire: staying a kilometre away does not mean it reached the houses.

The weather day by day

ECMWF ERA5 reanalysis at the fire location, the standard reference for past weather, and the Canadian Fire Weather Index (the same system Copernicus uses), computed by WorldFires from that data. Days after the fire run until the first rain.

Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)

Day	High	Min. humidity	Peak gust	Rain	Danger (FWI)
25 Oct	8.4 °C	30 %	35 km/h	0.0 mm	Moderate 12
26 Oct	4.4 °C	38 %	39 km/h	0.2 mm	Moderate 12
27 Oct	3.4 °C	37 %	46 km/h	0.0 mm	Moderate 13
28 Oct	3.9 °C	32 %	27 km/h	0.0 mm	Low 10
29 Oct	6.4 °C	43 %	28 km/h	0.0 mm	Low 10
30 Oct	8.4 °C	28 %	35 km/h	0.0 mm	Moderate 12
31 Oct after	8.1 °C	38 %	21 km/h	0.0 mm	Low 10
1 Nov after	4.8 °C	39 %	50 km/h	0.0 mm	Moderate 15
2 Nov after	1.2 °C	38 %	47 km/h	0.0 mm	Moderate 13
3 Nov after	7.6 °C	30 %	50 km/h	0.0 mm	Moderate 15
4 Nov after	11.1 °C	20 %	38 km/h	0.0 mm	Moderate 16
5 Nov after	9.5 °C	45 %	25 km/h	0.0 mm	Moderate 11
6 Nov after	9.4 °C	41 %	44 km/h	0.0 mm	Moderate 15
7 Nov after	0.0 °C	35 %	24 km/h	0.0 mm	Low 11
8 Nov after	-0.6 °C	60 %	41 km/h	1.2 mm	Very low 4

Before and after, from space

Drag the line to compare the same ground before the fire and after it.

↔

Before · 18 Oct 2025

After · 6 Nov 2025

Before After

If the day is cloudy, change the date: each satellite passes once a day. In false colour the burnt ground looks brown or red.

The smoke

CAMS · Copernicus

On 29 October 2025 the air beside the fire reached 60 µg/m³ of PM2.5. That day averaged 30: 2.0 times the WHO daily guideline (15).

PM2.5 peak60 µg/m³

Days over the guideline4 days

PM1068 µg/m³

Optical depth0.78

WHO 15

23242526272829303112

Good Fair Moderate Poor Very poor Extremely poor

Particles from the Copernicus CAMS model at the centre of the perimeter; these are not measurements in each town. The pale bar is the worst hour, the solid one the daily average.

Open-Meteo.com (CC BY 4.0) · Copernicus Atmosphere Monitoring Service (CAMS)

Detections table · 23Every satellite heat detection, one by one, with time, satellite, power and coordinates.

⬇ Download CSV Times in UTC. Each detection is a 375 m pixel: a large fire yields hundreds per pass.

Date and time	Satellite	FRP (MW)	Lat	Lon

Other fires nearby

All fires in China ›

Frequently asked questions

How long did the Longjiang County fire last?: GWIS (Copernicus) dates it between 25 October 2025 and 30 October 2025: 6 days between the first and last heat detection of the perimeter.
How much area did it burn?: The perimeter GWIS (Copernicus) rebuilt from heat detections is 1,130 hectares (11.3 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire only entered Longjiang County (1,126 ha, 0.2 %).
What was the weather like?: During the fire the temperature reached 8.4 °C, humidity dropped to 28 % and gusts hit 46 km/h. The fire danger index (FWI) reached 13, class Moderate.
Where does this data come from?: From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of China (geoBoundaries). It is not an official report.

Where to verify it

A satellite detection is not an official report. Final figures and the fire’s status are published by each country’s emergency service.

Emergency number: 119

Satellite cross-check

NASA FIRMS ↗
GWIS · Copernicus ↗

Does something look wrong on this page?

This page is built from satellite data and official records, and it sometimes gets things wrong: the wrong dates, the wrong town, two fires merged into one, or something that was not a wildfire at all. If you know this fire first-hand (you live nearby, saw it, fought it or reported on it), tell us what really happened and we will check it.

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Dates or duration Place or towns Burned area Name It was not a wildfire Same fire as another page Something else

What really happened?

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We will only use your email to reply about this report. Privacy. This is not an emergency service: if there is a fire now, call 119.

Where this data comes from

The perimeter comes from the Copernicus Global Wildfire Information System (GWIS), which rebuilds it from MODIS and VIIRS heat detections and publishes it under CC BY 4.0. It is not measured on imagery as in Europe, so it is an estimate. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. Municipal boundaries come from geoBoundaries ADM3 (Open Data Commons Open Database License 1.0). The area per municipality is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ from each country’s official figure.

Where it burned